Reports and Papers., Volume 11 |
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Anamosa bank beds blue clay bottom bowlder clay Braddyville brick buff building stone calcareous carbonate Carboniferous Cedar county channel chert Clarinda Clay county Coal Measures Coggan color Council Bluffs creek Cretaceous crinoidal crystalline deep deposits depth Devonian drainage drift plain east erosion exposed exposures flood plain formation fossils fragments Fusulina Geol geological glacial Gower limestone grains gravel gray hills inches Iowa Iowan Kansan drift lake laminated land layers ledges lime Linn Linn county Little Sioux loess lower material miles Missouri Missourian Moines river Nishnabotna Nodaway O'Brien county outcrops Page county paha pebbles places Pleistocene Pottawattamie county present quarry ravine Red Rock region ridges Saint Louis sand sandstone sandy seam seen shale silt slopes soft soil strata streams surface Tarkio thin Tipton topography township upland upper weathering yellow